Anne Hathaway is learning plenty of new things as a parent!
The 34-year-old actress and her Colossal co-star, Jason Sudeikis, stopped by The Ellen DeGeneres Show -- airing Thursday -- when they dished about their respective children. Hathaway has a 1-year-old son, Jonathan, with husband Adam Shulman, while Sudeikis has two kids with fiancee Olivia Wilde -- 2-year-old Otis and 6-month-old Daisy.
Hathaway said she threw her son a rainbow-themed bash for his first birthday party, but was quickly intimidated when she went on Pinterest for ideas.
WATCH: EXCLUSIVE -- Anne Hathaway on Filming 'Colossal' While Pregnant & Working With Kim Kardashian -- 'She's So Sweet'
"I made the mistake, I went on Pinterest and looked at other people's 1-year-old parties," she said. "It's not fair what some people do. Party planners have children, which is definitely not fair."
"Think about it. They blow it out," she joked.
As for 41-year-old Sudeikis, he candidly revealed what the difference is between having a son and a daughter.
"The biggest thing is the attention paid towards the direction of the wiping," he deadpanned. "Other than that, it's pretty similar. You gotta pay more attention. You gotta go with the group."
"I'm trying to say this as politely as possible," he added.
While on the subject, Hathaway admitted she's gotten peed on before by her son, and hilariously shared that there are "peepee teepees" available, though she doesn't use one on Jonathan.
"The teepee goes into the peepee, so that way when the peepee happens, the teepee absorbs it," she explained.
"So it looks like a little party hat on the peepee," Sudeikis cracked. "Why don't they have that for adults?"
Later, the trio played a fun game of "Guesstures' with dancer tWitch.
WATCH: EXCLUSIVE -- Anne Hathaway Stuns in Back-Baring Gown, Gives Advice to Expectant Mothers
ET recently sat down with Hathaway, where she talked about filming Colossal while pregnant, and talked about working with Kim Kardashian on Ocean's Eight.